Underground water undisturbed continuous sampling device

Abstract

The utility model discloses an undisturbed continuous sampling device for underground water, which comprises an inner air bag, an outer air bag, an inner steel pipe and an outer steel pipe, the inner air bag is arranged in the inner steel pipe, the outer air bag is arranged between the inner steel pipe and the outer steel pipe, the upper part of the inner air bag is provided with an inner air inlet and an inner water outlet, and the lower part of the inner air bag is provided with an inner water inlet; an outer air inlet and an outer water outlet are formed in the upper part of the outer air bag, an outer water inlet is formed in the lower part of the outer air bag, one-way valves are arranged between the outer water outlet and the outer water inlet and the outer air bag, and a water sample interface is formed in the bottom of the device.

Description

Technical Field

[0001] The utility model relates to the field of groundwater monitoring, in particular to a low-flow, undisturbed, and continuous groundwater sampling device. Background Art

[0002] Groundwater is not only an indispensable natural resource, but also an important environmental factor and ecological support condition. With the continuous development of social economy, people are developing and utilizing groundwater more and more, which has also brought about a series of ecological and environmental problems such as land subsidence, collapse, and groundwater pollution. In view of the increasingly serious groundwater pollution problem, it is necessary to strengthen the supervision of groundwater. To strengthen the supervision of groundwater, the groundwater quality must be monitored first.

[0003] The accuracy of groundwater monitoring depends on whether representative water samples can be collected. To regularly collect groundwater at the testing site, water samples are usually collected through testing wells that are tens of meters or hundreds of meters deep. After being collected on the ground and placed in containers, the water samples are stored at low temperatures and then sent to the laboratory for water quality analysis. A portable sampling pump is needed here to pump water. Because the wellhead is small and the well depth is large, there are certain requirements for the size and weight of the water sampling pump. Since it is necessary to accurately collect water samples containing volatile organic compounds, semi-volatile organic compounds, microorganisms, heavy metals and inorganic substances, when collecting water samples, try to ensure low disturbance to the water body to achieve the purpose of keeping the water quality consistent before and after collection. Traditional groundwater sampling usually uses a bele tube or a manual inertial pump as a sampling device. The use of a bele tube or a manual inertial pump will inevitably cause disturbance to the water sample in the monitoring well, and cannot meet the monitoring requirements for special indicators such as volatile organic compounds, thereby affecting the accuracy of water quality monitoring data. With the determination of sampling process specifications, the current mainstream sampling method is to use airbag pumps to achieve low-disturbance sampling. However, due to the limitation of the single-bag structure, water can only be discharged intermittently, and the timeliness of sampling is low, which often makes the well washing and sampling process take too long, requiring the collectors to be on duty on site for a long time. Therefore, it is particularly important to use appropriate sampling equipment in groundwater monitoring.

[0004] Utility Model Content

[0005] The utility model provides a low-flow, undisturbed, groundwater undisturbed continuous sampling device. As a reasonable supplement to the existing technical solutions and products, the utility model is realized through the following technical solutions:

[0006] A device for undisturbed continuous sampling of groundwater, comprising an inner air bag, an outer air bag, an inner steel pipe and an outer steel pipe, wherein the inner air bag is arranged in the inner steel pipe, and the outer air bag is arranged between the inner steel pipe and the outer steel pipe, an inner air inlet and an inner water outlet are arranged at the upper part of the inner air bag, an inner water inlet is arranged at the lower part, a one-way valve is arranged between the inner water outlet and the inner water inlet and the inner air bag, an outer air inlet and an outer water outlet are arranged at the upper part of the outer air bag, an outer water inlet is arranged at the lower part, a one-way valve is arranged between the outer water outlet and the outer water inlet and the outer air bag, and a water sample interface is arranged at the bottom of the device.

[0007] Preferably, the one-way valve is a sloped steel ball structure.

[0008] Preferably, an inner guide tube is further provided in the inner airbag, and a guide hole is provided below the guide tube so that the interior of the guide tube is in communication with the inner airbag.

[0009] The utility model has the following beneficial effects: the utility model adopts an airbag pump as a sampling pump, which can realize low-flow disturbance-free well washing and sampling, and fully complies with the sampling requirements of the "Technical Specifications for Groundwater Environmental Monitoring" HJ 164-2020 for volatile organic compounds. It uses less water and the water sample has no contact with the air, thus retaining the original state of the water sample to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for describing the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0011] Figure 1 It is a schematic diagram of the principle of a low-flow, undisturbed, groundwater undisturbed continuous sampling device of the utility model;

[0012] Figure 2 This is a schematic diagram of the external structure of a low-flow, undisturbed, groundwater undisturbed continuous sampling device of the utility model;

[0013] Figure 3 This is a schematic diagram of the structure of a low-flow, non-disturbance groundwater non-disturbance continuous sampling device after removing the outer steel pipe of the utility model;

[0014] Figure 4 This is a schematic diagram of the structure of a low-flow, non-disturbance groundwater non-disturbance continuous sampling device after removing the inner steel pipe of the utility model;

[0015] Figure 5 It is a schematic diagram of the water inflow state of the inclined steel ball structure of a low-flow undisturbed groundwater undisturbed continuous sampling device of the utility model;

[0016] Figure 6 It is a schematic diagram of the water discharge state of the inclined steel ball structure of a low-flow undisturbed groundwater undisturbed continuous sampling device of the utility model;

[0017] Figure 7 It is a schematic diagram of the water sample inlet state of a low-flow undisturbed groundwater undisturbed continuous sampling device of the utility model;

[0018] Figure 8 It is a schematic diagram of the water discharge state of the inner air bag of a low-flow, undisturbed, groundwater undisturbed continuous sampling device of the utility model;

[0019] Fig. 9 It is a schematic diagram of the water discharge state of the outer air bag of a low-flow, undisturbed, groundwater undisturbed continuous sampling device of the utility model; DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] Please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the utility model is a groundwater disturbance-free continuous sampling device, which comprises an inner airbag 1, an outer airbag 2, an inner steel pipe 3, and an outer steel pipe 4. The inner airbag 1 is arranged in the inner steel pipe 3, and the outer airbag 2 is arranged between the inner steel pipe 3 and the outer steel pipe 4. The inner airbag 1 is provided with an inner air inlet 11 and an inner water outlet 12 at the upper part, and an inner water inlet 13 at the lower part. A one-way valve is arranged between the inner water outlet 12 and the inner water inlet 13 and the inner airbag. The inner airbag 1 is also provided with an inner flow guide tube 14, and a flow guide hole (not shown in the figure) is opened below the flow guide tube 14 so that the inside of the flow guide tube 14 is connected with the inner airbag 1; the outer air inlet 21 and an outer water outlet 22 are arranged at the upper part of the outer airbag 2, and an outer water inlet 23 is arranged at the lower part. A one-way valve is arranged between the outer water outlet 22 and the outer water inlet 23 and the outer airbag 2. The above-mentioned one-way valves are all inclined steel ball structures 11, and the inner structure is as shown in FIG. Figure 5 , Figure 6 As shown, a water sample inlet 5 is provided at the bottom of the device.

[0023] When sampling using a groundwater undisturbed continuous sampling device, the process is as follows:

[0024] 1. Water sample status: Figure 7 Shown

[0025] 11) By exhausting the air inlet 11 and the air inlet 21, the outside of the inner and outer air bags is only at atmospheric pressure;

[0026] 12) The water sample in the well passes through the water sample inlet 5 due to the water pressure, pushing up the steel ball and entering the inner air bag 1 and the outer air bag 2 respectively;

[0027] 13) The inner airbag 1 is filled with water sample and expands to fit tightly against the inner steel tube 3;

[0028] 14) The outer airbag 2 is filled with water sample and expands to fit tightly against the outer steel tube 4;

[0029] Wait until the water sample completely fills the water bag, and the low-disturbance water sampling process is completed.

[0030] 2. Water discharge status of inner airbag: Figure 8 Shown

[0031] 21) By inputting air pressure into the air inlet 11 (which should be slightly greater than the water pressure of the corresponding water depth), the inner air bag 1 is squeezed from the outside;

[0032] 22) The water sample in the inner airbag 1 is squeezed through the inner flow guide tube 14 to seal the lower steel ball 11 and the upper steel ball

[0033] 11 is lifted up and opened, and the water sample is squeezed out from the water outlet 12;

[0034] 3. Water discharge status of the external airbag: Fig. 9 Shown

[0035] 31) By inputting air pressure into the air inlet 21 (which should be slightly greater than the water pressure of the corresponding water depth), the outer air bag 2 is squeezed from the outside;

[0036] 32) The water sample in the outer air bag 2 is squeezed to seal the lower steel ball 11, and the upper steel ball 11 is lifted up and opened, and the water sample is squeezed out from the water outlet 22;

[0037] Through the above process, when the inner air bag 1 discharges water, the outer air bag 2 completes water intake, and vice versa; by continuously and alternately supplying air to the air inlet 11 and the air inlet 21, continuous water extraction is achieved.

[0038] The preferred embodiments of the utility model disclosed above are only used to help explain the utility model. The preferred embodiments do not describe all the details in detail, nor do they limit the utility model to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the utility model, so that technicians in the relevant technical field can well understand and use the utility model. The utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A groundwater undisturbed continuous sampling device, characterized in that: The device for undisturbed continuous sampling of groundwater comprises an inner air bag, an outer air bag, an inner steel pipe and an outer steel pipe. The inner air bag is arranged in the inner steel pipe, and the outer air bag is arranged between the inner steel pipe and the outer steel pipe. The upper part of the inner air bag is provided with an inner air inlet and an inner water outlet, and the lower part is provided with an inner water inlet. A one-way valve is arranged between the inner water outlet and the inner water inlet and the inner air bag. The upper part of the outer air bag is provided with an outer air inlet and an outer water outlet, and the lower part is provided with an outer water inlet. A one-way valve is arranged between the outer water outlet and the outer water inlet and the outer air bag. A water sample interface is arranged at the bottom of the device.

2. The groundwater undisturbed continuous sampling device according to claim 1, characterized in that: The one-way valve is a sloped steel ball structure.

3. The groundwater undisturbed continuous sampling device according to claim 1, characterized in that: An inner flow guide tube is also arranged in the inner air bag, and a flow guide hole is opened below the flow guide tube so that the inside of the flow guide tube is connected with the inner air bag.

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